Overpainted complex decoration and fine-art murals were exposed conserved and reinstated using traditional methods and matrials. Twenty-eight murals by Francis Mueller, a frequent collaborator of both this architect and contemporary Patrick Keely, were painstakingly restored to the artist's original style and intent.

The intricately carved marble high altars and side altars were successfully cleaned and conserved to remove decades of grime, dirt, and over-varnishing.